Bobbin-controlling adjunct for sewing-machine shuttles



April 8 ,1924.v 1,489,942

- E. D. HUME BOBBIN CONTROLLING ADJUNCT FOR SEWING MACHINE SHUTTLES Filed Oct. l2 1922 I I /l l 1722165261- EZBHume Patented Aprc 8, 1924.

lASdfidZ EDGAR D. HUME, 0F CQLLINGSRVOOD, NEW JERSEY, ASSIGNOR T0 SUMMIT THPVEAD COMPANY, OF EAST HAMPTON, CONNECTICUT, A CORPQRMQTIOIQ O31 MAIIIE.

BOBIBIN-CGNTROLLING ADJ'UIICT FOR SEVJING-MACHINE SHUTTLES.

Application filed October 12, 1922. Serial No. 593,9?9.

2 0 all whom it may concern.

Be it known that I, EDGAR D. HUME, a citizen of the United States, residing at Collingswood, in the county of Camden and State of New Jersey, have invented new and useful Improvements in Bobbin-Controlling Adjuncts for Sewing-Machine Shuttles, of which the following is a specification.

This invention relates to a shuttle having a central post on which a ready wound bobbin is rotatable, a bobbin chamber surrounding the post, pressing means interposed between the bottom of the bobbin chamber and a bobbin on the post to exert outward pressure on the bobbin, and stop means at the outer end of the chamber to confine the bobbin in its operative position on the post, undesirably loose and free rotation oi the bobbin being prevented by the frictional contact of the pressing means with the bobbin and by the frictional contact of the bobbin with the stop means.

The object of the invention is to provide an improved pressing adjunct, separable from the shuttle and adapted not only to exert a. suitable outward pressure on the bobbin when the latter is operatively installed and confined, but also to automatically engage the post when the bobbin is released and removed, in such manner as to prevent th accidental removal of the adjunct from the shuttle and to permit the removal of said adjunct by moderate force exerted for that purpose.

The invention is embodied in the improvements hereinafter described and claimed.

Of the accompanying drawings forming a part of this specification,

Figure 1 is a sectional view on an enlarged scale of a shuttle having a bobbinpressing adjunct embodying the invention and showing a ready wound bobbin operatively installed.

Figure 2 is a view similar to Figure 1 showing the shuttle and pressing adjunct as they appear when the bobbin is removed and the adjunct con ined against accidental removal.

Figure 3 is a fragmentary perspective view showing a portion of the shuttle body and the post.

Figure is a plan view, and

Figure 5 is a perspective view each showing the bobbin pressing adjunct inverted and removed from the shuttle.

Figure 6 is a sectional View showing the bobbin pressing adjunct in the condition shown by Figure 2, port-ions of the shuttle body and post being shown by dotted lines.

Figure 7 is a sectional view showing the bobbin pressing adjunct in the condition shown by Figure 1. i

The same referencecharacters indicate the same parts in all of the figures.

The shuttle which I have chosen for illustration of my invention is of a well known type and is one of several types to which the pressing adjunct hereinafter described may be applied.

The shuttle body includes an inner side portion 12 and a circular curb 13 forming respectively the bottom and the wall of a bobbin chamber. Projecting from the bot tom 12 is a central tubular post 1% on which the core 15 of a ready wound bobbin, which includes a thread winding 16, is adapted to rotate.

The stop means releasably confining the bobbin in its operative position ma; be embodied in a latch arm 17 having a camshaped inner end 18 connected by a pivot stud 10 with the outer end of the post and confined in either of the pos tions shown by Figures 1 and 2 by a plunger 20 pressed by a spring 22 against the cam-shaped end l8.

A. bobbin, confined as shown by Figure 1.,is pressed outward against the latch arm 17, by an adjunct embodying my invention. Said adjunct includes a smooth surfaced sheet metal disk 23 formed to bear on the inner end of tee bobbin, and provided with a central orifice 24 formed to loosely surround the post 14-. The adjunct also includes resilient pressing means fixed to the disk and removable therewith from the shuttle, said pressing means being provided with clutch means adapted to so engage the post when the bobbin is removed as to prevent accidental removal of the adjunct from the post and topermit forcible removal of the adjunct when such removal is desired.

I prefer to embody said pressing means in a plurality of legs of resilient sheet metal such as phosphor bronze, two of such legs being preferably employed. In this instance each leg includes an inner end por tion 25 fixed to the disk as by soldering or brazing, although if desired the inner end portions may be integral with the disk, the disk and the legs being made by bending a suitabl formed blank so that necks are forme at 26 (Fig. 5) connecting the inner1 ends of the legs with .the margin of the dis r.

The major portions 25 of the legs are normally inclined in opposite directions from the inner side of the disk as shown by Figures 1, 2, 5, 6 and 7 their maximum inclination, shown by Figures 2 and 6, being suflicient to project the disk into the space occupied by the bobbin, so that when the bobbin is removed the disk is raised as shown by Figure 2. When the bobbin is operatively installed and confined, the disk is pressed inward, and the leg portions 25 assume a lesser inclination as shown by Figure 1. Each major portion 25 is provided with a clutch aw 26, each aw having a reentrant curvature conforming to a portion of the periphery of the post 14. The arrangement of the jaws is such that when the bobbin is in its operative position thejaws are out of contact with the post as indicated by Figures 1 and 7, so that the disk is freely movable on the post. When the bobbin is removed the changed inclination of the leg portions 25 shown by Figures 2 and 6, causes the jaws 26 to grip the post sufiiciently to oppose further movement of the jaws toward the outer end of the post, and therefore prevent liability of the accidental removal of the adjunct from the shuttle, so that the .adjunct is separable from the shuttle only by force sufiicient to overcome the gripping engagement of the jaws with the post.

When the bobbin is in its operative position the inclination of the leg portions 25 is such as to render the jaws inoperative so that the disk is yieldingly pressed by the leg portions against the bobbin and yieldingly presses the bobbin against the latch arm 17.

In this embodiment of the invention the portion of the post 14 with which the aws cooperate, is provided by a resilient sleeve 14% sprung upon the body of the post and forming an enlargement thereof, adapting the post to have a somewhat close frictional bearing on the bobbin core 15. This sleeve is not an essential feature in all cases.

I claim:

1. A bobbin-controlling adjunct for a sewing machine shuttle having a bobbin chamber surrounding a central post, said adjunct comprising a bobbin-pressing disk having a central orifice formed to loosely receive the post; and a resilient pressing means fixed to the disk, removable therewith from the shuttle, and provided with clutch means. adapted to engage the post when the bobbin is removed, and thereby prevent accidental removal of the adjunct from the post, said clutch means being inoperative when the bobbin is operatively installed in the shuttle.

2. A bobbin-controlling adjunct for a sewing machine shuttle having a bobbin chamber surrounding a central post, said adjunct comprising a bobbin-pressing disk having a central orifice formed to loosely receive the post; pressing means comprised of a plurality of resilient legs fixed to the disk and having inclined free portions bearing on the bottom of said chamber to press the disk outward from said bottom, said legs being provided with clutch jaws adapted to engage the post when the bobbin is removed and thereby prevent accidental removal of the adjunct from the post, said jaws being inoperative when the bobbin is operatively installed in the shuttle.

In testimony whereof I have affixed my signature.

EDGAR D. HUME. 

